GitLab

This enables JavaScripts projects to have live previews straight in the
browser without requiring any local configuration. This uses the
CodeSandbox package `sandpack` to compile it all inside of an iframe.

This feature is off by default and can be toggled on in the admin
settings. Only projects with a `package.json` and a `main` key are
supported.

Updates happen in real-time with hot-reloading. We just watch for
changes to files and then send them to `sandpack` to allow it to reload
the iframe. The iframe includes a very simple navigation bar, the text
bar is `readonly` to stop users navigating away from the preview and
the back and forward buttons just pop/splice the navigation stack
which is tracked by a listener on `sandpack`

There is a button inside the iframe which allows the user to open the
projects inside of CodeSandbox. This button is only visible on
**public** projects. On private or internal projects this button
get hidden to protect private code being leaked into an external
public URL.

Closes #47268

Use object.assign for default option

- Cleans up CSS to use common classes
- Removes getters to use mapState instead
- Makes the first request even when tab is not visible
- Show loading state in 204

Creates an app to render grouped test reports in the MR widget
Ports CSS from EE into CE
Creates a reusable code component
Adds getters and utils to the existing reports store

Closes #49892

fixed folder deletions not adding to changedFiles

This reverts commit 8717c7da.